could probably tack it on temporarily with double stick adhesive tape, just to see if you like the look and feel (would leave marks in the finish if left on too long though).Also, I'm guessing the only way I'd be able to install that is by drilling some holes in the bass, huh? Not something I think I want to do, thought I do think they look cool.
I think the 4s all come with the pickup covers, none of the 5s do (mine V7s are both 5s).